<?php
/* Libchart - PHP chart library
* Copyright (C) 2005-2007 Jean-Marc Tr�meaux (jm.tremeaux at gmail.com)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
*/

/*! \mainpage Libchart
*
* This is the reference API, automatically compiled by <a href="http://www.stack.nl/~dimitri/doxygen/">Doxygen</a>.
* You can find here information that is not covered by the <a href="../samplecode/">tutorial</a>.
*
*/

/**
	 * Base chart class.
	 *
	 * @author Jean-Marc Tr�meaux (jm.tremeaux at gmail.com)
	 */
abstract class Libchart_View_Chart_Abstract {
	/**
		 * The data set.
		 */
	protected $dataSet;

	/**
		 * @var Libchart_View_Plot_Plot Plot (holds graphical attributes).
		 */
	protected $plot;

	/**
		 * Abstract constructor of Chart.
		 *
		 * @param integer width of the image
		 * @param integer height of the image
		 */
	protected function __construct($width, $height) {
		// Creates the plot
		$this->plot = new Libchart_View_Plot_Plot($width, $height);
		$this->plot->setTitle("Untitled chart");
		$this->plot->setLogoFileName(IMAGE_DIR . "/chart/PoweredBy.png");
	}

	/**
		 * Checks the data model before rendering the graph.
		 */
	protected function checkDataModel() {
		// Check if a dataset was defined
		if (!$this->dataSet) {
			die("Error: No dataset defined.");
		}
		// Maybe no points are defined, but that's ok. This will yield and empty graph with default boundaries.
	}

	/**
		 * Create the image.
		 */
	protected function createImage() {
		$this->plot->createImage();
	}

	/**
		 * Sets the data set.
		 *
		 * @param DataSet The data set
		 */
	public function setDataSet($dataSet) {
		$this->dataSet = $dataSet;
	}

	/**
		 * Return the plot.
		 *
		 * @return plot
		 */
	public function getPlot() {
		return $this->plot;
	}

	/**
		 * Sets the title.
		 *
		 * @param string New title
		 */
	public function setTitle($title) {
		$this->plot->setTitle($title);
	}
}